Bluetooth: monitor: Fix sending logs over RTT

This fixes Bluetooth logs that were not sent over RTT.
Minor cleanup has been made to limit the number of ifdefs.

> ACL Data RX: Handle 0 flags 0x02 dlen 11      #1049 83.117000
      ATT: Handle Value Indication (0x1d) len 6
        Handle: 0x0003
          Data: 0100ffff
= bt: bt_att: Unhandled ATT code 0x1d                 83.117100
> HCI Event: Disconnect Complete (0x05) plen 4  #1050 84.247700
        Status: Success (0x00)
        Handle: 0
        Reason: Remote User Terminated Connection (0x13)

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>